Major disadvantages of hydroponics include

Hydroponics has been successfully employed as a technique for the commercial production of......

While producing hydroponic plants,which of the following metals is added along with $EDTA$?

What is hydroponics?

Hydroponics is a system of growing plants in

Carefully observe the following figure.
$(a)$ Name the technique shown in the figure and the scientist who demonstrated this technique for the first time.
$(b)$ Name at least three plants for which this technique can be employed for their commercial production.
$(c)$ What is the significance of the aerating tube and feeding funnel in this setup?